31131432432340 has 24 divisors (see below), whose sum is σ = 65376247662432. Its totient is φ = 12452527343520.

The previous prime is 31131432432301. The next prime is 31131432432557. The reversal of 31131432432340 is 4323423413113.

It is a junction number, because it is equal to n+sod(n) for n = 31131432432296 and 31131432432305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3039595 + ... + 8455885.

It is an arithmetic number, because the mean of its divisors is an integer number (2724010319268).

Almost surely, 2^{31131432432340} is an apocalyptic number.

It is an amenable number.

31131432432340 is an abundant number, since it is smaller than the sum of its proper divisors (34244815230092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31131432432340 is a wasteful number, since it uses less digits than its factorization.

31131432432340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703687 (or 5703685 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

Adding to 31131432432340 its reverse (4323423413113), we get a palindrome (35454855845453).

The spelling of 31131432432340 in words is "thirty-one trillion, one hundred thirty-one billion, four hundred thirty-two million, four hundred thirty-two thousand, three hundred forty".